API SPEC 5B Working Gauges
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API Spec 5B plug/ring working gages
Upset (E. U. E) /Non-upset (N. U. E) Tubing
We have strict quality control system ---ISO 9001. Meanwhile, all of our export products provide independent third-party certification which is recognized by API. The Baoji City Jintai District Baoshi oil thread gauge testing institution is the professional and authoritative testing institution in China. Their master gages registration NO. was recorded in API and National institute of Metrology P. R. China. They also passed the National Accreditation Service for Conformity Assessment (CNAS) . So the examination in the institution is world-level.